<template>
 <div>
   <router-link 
   tag="div" 
   to="/" 
   class="header-abs"
   v-show="showAbs"
   >
     <div class="iconfont deatile-backBtn">&#xe697;</div>
   </router-link >
   <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
     <router-link tag="div" to="/" class="iconfont header-backBtn">&#xe697;</router-link> 
     景点详情
   </div> 
 </div>	
</template>

<script>
import CommonGallary from 'common/gallary/Gallary'
export default {
	name: 'DeatileHeader',
  data () {
    return {
      showAbs: true,
      opacityStyle : {
        opacity : 0
      }
    }
  },
  methods:{
    handleScroll () {
      const top = document.documentElement.scrollTop
      if (top > 60) {
        let opacity = top / 140
        console.log(top)
        opacity = opacity > 1 ? 1 : opacity
        this.opacityStyle = { opacity : opacity }
        this.showAbs = false
      }else {
        this.showAbs = true
      }
    }
  }
  ,
  activated () {
    window.addEventListener('scroll',this.handleScroll)
  },
  deactivated () {
    window.removeEventListener('scroll',this.handleScroll)
  }
}
</script>

<style lang="stylus" scoped>
 @import '~styles/varibles.styl'
  .header-abs
    position:absolute
    left:.2rem
    top:.2rem
    width:.8rem
    height:.8rem
    border-radius:.4rem
    line-height:.8rem
    background:rgba(0,0,0,0.8)
    text-align:center
    .deatile-backBtn
      color:#fff
      font-size:.5rem
  .header-fixed
    position:fixed
    z-index:2
    top:0
    left:0
    right:0
    height: $headerHeight
    line-height: $headerHeight
    text-align: center
    background: #00bcd4
    color: #fff
    font-size: .3rem
    overflow: hidden
    bottom
    .header-backBtn
       width:.64rem
       position:absolute
       top:0
       left:0
       text-align:center
       font-size: $backBtn
       color:#fff    
</style>